[MacPorts] #39975: root: Add --enable-cxx11 when using libc++

[MacPorts]

#39975: root: Add --enable-cxx11 when using libc++
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  Reporter:  jfcaron@…    |      Owner:  jeremyhu@…
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.2.0
Resolution:               |   Keywords:
      Port:  root         |
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Comment (by jeremyhu@…):

 Replying to [comment:13 jonesc@…]:
 > Is there a macports way of checking what c++ runtime is being used ? Or
 is it enough to just enable this for osx 10.9 where the libc++ runtime is
 now default ?
 >
 > Chris

 On base trunk, you can check configure.cxx_stdlib ... on older base, it's
 the default for the OS version.

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Ticket URL: <https://trac.macports.org/ticket/39975#comment:14>
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